Lubricating system for sewing machines



June 1958 H. K. CIECIOR 2,837,173

LUBRICATING SYSTEM FOR SEWING MACHINES Filed July 15, 1955 3 Sheets-Sheet l III/II A\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ 11/11/1 40/0,

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INVENTOP, Heinrich K. Ciao/or H. K. CIECIOR LUBRICATING SYSTEM FOR SEWING MACHINES June 3, 1958 Fild July 15, 1955 3 Sheets-Sheet 2 wk W \n-Inml/vmwme, H6177 r/ H /6- C l'cor'a r June 3, 1958 H; K. ClEClOR LUBRICAIING SYSTEM FOR SEWING MACHINES s Sheets-Sheet 3 Filed July 15, 1955 l i F Jndnstrie-Werke Karlsruhe .Aktiengesellschaft, Karls- .rn eGc many Application m is -1955; Serial No. 522,334 glaimspricr ty aRPlicationGermany July 19, 1954 Theinvention relates to industrial sewing machines and, more particularly, to a'lubricating system for sewingniachines, especiallyiindustrialsewing machines, with two' delivery pumps. The continuously increasing requirements to be met by sewing machines, especially industrial high speed sewing machines, make proper lubrication of .all driving parts and. a proper oil feeding imperative in order to prevent the driving parts from running hot and from wearing prematurely.' Furtherrnorefany undesired accumulation andleakage of oil must under all [circumstances be prevented in order to avoid soiling the hands of the operator and the'mater'ial robe sewed. I v

Lubricating systems have been suggested which afiord a completely automatic lubrication of all driving parts of a sewing machine which also automatically withdraw accumulating oil, for instancetheoil accumulating in the sewing machine head. These known systems, however, have the drawback that an insuflicient lubrication only is obtained, especially if for some reason the sewing machine is temporarily slowed .down. 7

It is, therefore, an object of the present invention to provide a lubricating system for sewing machines, vespecially industrial sewing machines, which, while being suitable forhigh speed industrial sewing machines, will avoid the drawback outlined above.

United States Patent his another object of this invention ,to provide a lubricating system for sewing machines, especially industrial sewing machines, which will at all times and also at low speeds provide a satisfactory automatic lubricationof ,all driving'parts of the sewing machine.

It is still another object of this invention to provide a lubricating system of the type set forth in the preceding paragraphs which will make it .PQssible for the operator to verify the proper lubrication of the driving partslduring the operation of the sewing machine without having to take, the sewing machine apart.

It is ,a still further object of this invention to provide a sewing machine, especially high speed industrialsewing machine,with a reliable lubricating system which i s relatively simple in construction and can easily be installed in sewing machines of the type involved.

These and other objects and advantages of the invention will appear more clearly from the following specification in connection with the accompanying drawings, in which:

Eig. 1is.alongitudinalsection and partial view of a sewing machine according -to the invention.

fig, 2 is .a section taken along the line I III of Fig. 1.

Fig. 3 is a section taken along the line IlI-II-I of Fig. l.

Fig. 4 is a top view of the sewing machine shown in Fig; 1 with thenppercover omitted in order more clearly .to indicate the position .of two delivery pumps associated ,with the sewing machine according to the invention.

Fig. 5 ',shows on a somewhat larger scale than that 2,837,173 iPatented June 3, 1958 :2 employed in'iEigs. 1 to 4.the.upper distributor withthe connection lines leading to the two delivery pumps shown in .-Fig. 4.

General arrangement I The primary-feature of thepresent'invention consists in the provision of a pressure'pump for distributing the lubricating oil and in the provision of a suction pump for withdrawing excessive oilfrom the machine body. The arrangement is such thatthe pressure side of the pressure pump is connected through an adjustable distributor and-a connection line with the suction side .of the suctionpump. "For purposes of distributing the oil to the :indivi dual'lubricating"points, an oil distributortis provided between the 'oil pressure pump and the lubricating points, said'oil distributor being provided with control throttling screws. In order, furthermore to be able to'c'heck the passage of the oil, the pump accordingto theinvention is provided with an overflow pipe known per se and arranged below a sight glass, or a similar oil circulation indicating mechanism is provided'which is preferably arranged on the upper part of the sewing machine. In order to'simplify the installation of the oil conduits, these-conduits are preferably made of an oil pressure resistant material. The oil conduits or lines are --connected t othe feeding'and distributing elements of the lubricating system by means of metallic nipples. This lubricating system according to the invention will at all times, iiezalso at low speed'of the sewing machine, assure a'safe and proper lubrication of all moving driving parts and the parts subjected to friction thereby.

- Structural arrangement Referring now to the drawings in detail, the sewing machine shown therein comprises a hollow material supgeneral :oil chamber and is arranged near the bottom of the oil pan 5.

The Ewithdrawn oil passes through the connecting nipple 1 1 into the-suction opening of 'the pressure pump .2 and is delivered under pressure through an oil conduit 12 into the-lower oil distributor 13. The said oil distributori13 is arranged near the pressure pump 2 and is connected to the plate 10f the machine by means or screws or the like (Figs. 1, 3 and 4). This oil distributor 13 has connected thereto a plurality of oil branch points 16, 17, 18 and 19. The flow of oil'through the said branch points may be controlled by throttling screws Ziland 21. Oil conduits 22, 23 and 24 respectively connected tothe branchpoints 16, 17 and 18'feed :the required quantity of oil 'to'the respective lubricating points of the driving parts located in the lower machine 'frame :and the'hollow plate 1.

Connected to the oil branch point 19 of the lower oil distributor '13 is an oil conduit 25 requiredfor the necessary .oil in the upper machine part 26 and leading through the machine neck 47 to the oil distributor 29 .which is arranged in the upper machine part 26 above the upper machine shaft 30. The upper oil distributor 29 is likewise provided with oil branch points 33, 34 and 3.5 :provided with a throttling screw 36. The oil flowing out of the soil branch point 33 passes through the oil conduit .-3,7'-to the oil consumption point 38 of the sliding bearing for the :upper machine shaft 30. From here the :oil passes to the individual driving parts'for the sewaccumulation 39 at the-lowermost point of the-head 40.

This lowermost point in the head'40 is designed 'so that no oil can leak out. The oil accumulation 39 is Withdrawn through a suction conduit 41 which has its lower.

end 42 submerged in the oil sump 39, while its other end i 43 is connected to a suction upper machine shaft 30. V

In order to assure a proper suction effect of the sucpump 44 mounted on the 'tion pump 44 also at low speeds of the machine, oil

under pressure is fed to the suction pump 44 from the oil branch point 34 .(Fig. at the upper oil distributor 29 through an oil conduit 45 which leads into the suction conduit 41. In this connection it'will be appreciated thatthe suction pump in order to be able to withdraw oil from the oil sump 39, there is always a certain quantity of oil necessary, particularly at low speed of the pump .44. If little oil is available in the oil sump 39, pump 44 will quickly withdraw the same and will then draw air. While a small quantity of air in'the suction pump will not be harmful, too much air will seriously affect the suction ability of the pump. In order always to be able to produce a suction eifect, the suction pump draws through the oil conduit 45, oil distributor29 and conduit means such a in order always to be able to produce a proper suction effect so that a proper suction effect of pump 44 will always be assured.

The withdrawn oil leaves the suction pump 44 at 10 and returns to the oil pan 5 through the hollow space in the neck 47.

In order to enable the operator to verify that the oil circulation is properly efiected, one of the oil conduits, expediently at the upper oil distributor 29, is provided with an oil circulation indicator. In the present instance this indicator consists of an oil overflow pipe 31 which is connected at to the upper distributor and extends into a sight glass 27 arranged upon the upper cover 28 of the sewing machine body.

As a further development of the invention, the oil conduits instead of being made of metal, consist of an oil and pressure resistant synthetic material which oil conduits are then by metallic connecting means connected to the individual elements of the oil circulating lubrication.

quantity of oil as is necessary The known general type pumps in which radial slides a are arranged in an eccentrically journalled cylindrical body and slide along the inner casing wall of such pumps may be used as pressure and/or suction pump.

It is, of course, understood that the present invention is, by no means, limited to the particular construction shown in the drawings but also comprises any modifications within the scope of the appended claims.

What I claim is:

1. In a lubricating system for a sewing machine, especially industrial sewing machine, having a hollow table member, a head, a cantilever member carrying said head, and a neck connectingsaid table member to said cantilever member, the combination of: an oil reservoir connected to one of said members, a first shaft extending into said one member, a first pump having a suction side communicating with said oil reservoir and having a pressure side for deliveringoil under pressure to parts to be lubricated in said sewing machine, said first pump being arranged for driving connection with said first shaft, a second shaft extending into the other one of said members and arranged for driving connection with said first shaft, an oil accumulating chamber arranged in said head for accumulating excessive oil, a second pump having a suction side communicating with said accumulating chamber and having a discharge side for returning the oil drawn in from said accumulating chambet to said oil reservoir,

and conduit means connecting assure the pressure side'of said first pump with the suction side of said second pump.

2. In a lubricating system for a sewing machine, especiallyindustrial sewing machine, having a hollow table member, a head, acantilever member carrying said head, and a neck connecting said table members to said cantilever member, the.combination of an oil reservoir connected to one of said members, a first shaft extending into said one member, a firstpump having a suction side communicating with said oil-reservoir and having a pressure side for delivering oil under pressure to parts to be lubricated in said sewing machine, said first pump being arranged for driving connection with said first shaft, a second shaft extending into the other one of saidmembers and arranged for driving connection with said first shaft, an oil accumulating chamber arranged in said head for accumulating excessive oil, a second pump having a suction side communicating with said accumulating chamber and having a dischargeside for returnin g'the oil drawn in from :said accumulating chamberv to said oil reservoir, conduit means connecting the pressure side of said first pump with. the suction side'of said second pump, and adjustable distributor means interposed within saidconduit means for'varying the flow of oil under pressure therethrough. I

3'. In a lubricating system fora sewing machine, especially industrial sewing machine, having a hollow table member, a head, a cantilever member carrying said head, and a neck connectingsaid table member to said cantilever member, the combination of: an oil reservoir connected to one of saidme mbers, a first shaft extending into said one member, a first pump having a'suction side communicating with said oil reservoir and having a pressureside for delivering oil under pressure to parts to be lubricated in said sewing machine, said first pump being arranged for driving connection with said first shaft, first conduit means leading from'said pressure side to said parts to be lubricated, distributor means interposed in said first conduit means, a second shaft extending into the other one of-said members and arranged for driving connectionwith said first shaft, an oil accumulating chamber arranged in said head for accumulating excessive oil, a second pump having a suction side communicating with said accumulating chamber and having a discharge side for returning the oil drawn in from said accumulating chamber to said oil reservoir, and second conduit means connecting the pressure side of said first pump with the suction side of said second pump. t 1

4. In' a lubricating system for a sewing machine, especially industrial sewing machine, having a hollow table member, a head, a cantilever member carrying said head, and a neck connecting said table member to said cantilever member, the combination of: an oil reservoir connected to one of said members, afirst shaft extending into said onemember, a first pump having a suction side communicating with said oil reservoir and having a pressuresidefor delivering oil under pres sure to parts to be lubricated in said sewing machine, said first pump being arranged for driving connection with said first shaft, first conduitmeans leading from said pressure side to said parts to be lubricated,- distributor means interposed insaid first conduit means, a second shaft extending into the. other one of said members and arranged for driving connection with said first shaft, an oil accumulating chamber arranged in said head for accumulating excessive oil, a second pump having a suction side communicating with said accumulating chamber and having a discharge-side for returning the oil drawn in from said accumulating chamber to said oil reservoir, second conduit means connecting the pressure side of said first pump with the suctionside of said second pump, and control means associated with said distributor means and arranged for controlling the flow of oil there- I through to the parts to be lubricated and to the suction side of said second pump.

- 5. In a lubricating system for a sewing machine, especially industrial sewing machine, having a hollow table member, a head, a cantilever member carrying said head, and a neck connecting said table member to said cantilever member, the combination of: an oil reservoir connected to one of said members, a first shaft extending into said one member, a first pump having a suction side communicating with said oil reservoir and having a pressure side for delivering oil under pressure to parts to be lubricated in said sewing machine, said first pump,

being arranged for driving connection with said first shaft, first conduit means leading from said pressure side to said parts to be lubricated, distributor means interposed in said first conduit means, a second shaft extending into the other one of said members and arranged for driving connection with said first shaft, an oil accumulating chamber arranged in said head for accumulating excessive oil, a second pump having a suction side and being drivingly connected to said second shaft, second conduit means effecting communication between said suction side and. said oil accumulating chamber, said second pump also having a discharge side for returning the oil drawn in from said accumulating chamber to said oil reservoir, fluid flow indicating means visible from the outside of said sewing machine and communicating with said first conduit means, and third conduit means connecting said distributor means and thereby said first conduit means with said second conduit means and thereby with the suction side of said second pump.

6. In a lubricating system for a sewing machine, especially industrial sewing machine, having a hollow table member, a head, acantilever member carrying said head, and a neck connecting said table member to said cantilever member, the combination of: an oil reservoir connected to one of said members, a first shaft extending into said one member, a first pump having a suction side and a pressure side, first conduit means efiecting communication of said suction side with said oil reservoir, second conduit means connected to said pressure side of said pump and leading to parts to be lubricated of said machine, said first pump being arranged for driving connection with said first shaft, a second shaft in the other one of said members and arranged for driving connection with said first shaft, an oil accumulating chamber arranged in said head for accumulating excessive oil, a second pump drivingly connected to said second shaft and having a suction side for withdrawing oil from said 011 accumulating chamber, third conduit means effecting communication between said oil accumulating chamber and the suction side of said second pump, said second pump also having a discharge side for discharging oil withdrawn from said accumulating chamber to said oil reservoir, at least one of said first, second and third conduit means being composed of oil and pressure resistant synthetic material, and fourth conduit means connecting the pressure side of said first pump with the suction side of said second pump.

7. In a lubricating system for a sewing machine, especially industrial sewing machine, having a hollow table member, a head, a cantilever member carrying said head, and a neck connecting said table member to said cantilever member, the combination of: an oil reservoir connected to one of said members, a first shaft extending into said one member, a first pump having a suction side and a. pressure side, first conduit means arranged for effecting communication between said oil reservoir and said suction side, second conduit means having one end arranged for connection with said pressure side, distributor means connected to said second conduit means, branch lines arranged for connection with said distributor means and leading to the parts to be lubricated in said machine, a second shaft extending into the other member and being drivingly connected with said first shaft, a second pump having a suction side and a discharge side, an oil accumulating chamber provided in said head, third conduit means effecting communication between said oil accumulating chamber and said suction side of said second pump, said discharge side of said second pump being arranged to return oil withdrawn from said accumulating chamber to said oil reservoir, fourth conduit means connecting the suction side of said second pump with the pressure side of said first pump, and metallic nipple means connecting the respective conduit means to said first and second pumps and said distributor means.

References Cited in the file of this patent UNITED STATES PATENTS 

